# Security alert \[11/24/2016\]: Consensus bug in geth v1.4.19 and v1.5.2

DevFeed: [Security alert \[11/24/2016\]: Consensus bug in geth v1.4.19 and v1.5.2](<https://devfeed.tech/articles/security-alert-11-24-2016-consensus-bug-in-geth-v1-4-19-and-v1-5-2-16791.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2016/11/25/security-alert-11242016-consensus-bug-geth-v1-4-19-v1-5-2>)

Author: Vitalik Buterin

Published: 2016-11-25T01:13:58Z

Content type: release

Language: en

Sources: [Ethereum Foundation Blog](<https://devfeed.tech/sources/ethereum-foundation-blog.md>)

Topics: [Security](<https://devfeed.tech/topics/security.md>), [bug](<https://devfeed.tech/topics/bug.md>), [Blockchain](<https://devfeed.tech/topics/blockchain.md>), [Ethereum](<https://devfeed.tech/topics/ethereum.md>), [Network](<https://devfeed.tech/topics/network.md>)

Tags: [blockchain](<https://devfeed.tech/tags/blockchain.md>), [bug](<https://devfeed.tech/tags/bug.md>), [consensus](<https://devfeed.tech/tags/consensus.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [fork](<https://devfeed.tech/tags/fork.md>), [network](<https://devfeed.tech/tags/network.md>), [release](<https://devfeed.tech/tags/release.md>), [security](<https://devfeed.tech/tags/security.md>), [update](<https://devfeed.tech/tags/update.md>)

## AI overview

A security alert reports that a journaling bug in affected Geth versions caused an Ethereum network fork at block 2686351. Geth 1.5.3 fixes the issue and repairs the fork; users are advised to update, while third-party providers may provide their own instructions.

## Source excerpt

Security Alert Affected configurations: Geth Severity: High Summary: An issue has been identified with Geth's journaling mechanism. This caused a network fork at block #2686351 (Nov-24-2016 14:12:07 UTC). The...